Well, i myself havn't had any luck running ReactOS on AMD machine, but thats just lack of compatibility. Intel users are running some games pretty good. And having no antivirus isn't that bad as long as you don't visit those you-know-what sites. at-least the really dirty ones ;)
But the problem that some AVs recognise these EXEs as viruses, is because they patch either some files on your hard drive or in the RAM.
(script enhancer patches ram for example).